In which situation is no work considered to be done by a force? a. when the angle between the force and displacement is 180° b. when the angle between the force and displacement is 90° c. when the angle between the force and displacement is 45° d. when the angle between the force and displacement is 0°

If the angle is either 0 or 180, that means that there is either negative or positive work, so A and D are not correct.

If the angle is 45, then there is still some work involved.

The only option where there is no work done by a force is B. when the angle is between the force and displacement is 90. 

The correct answer is option B.

Explanation:

Work done is defined as product of applied force to an object and displacement that is distance covered by an object when force applied.